Amyand Hernia

An Amyand hernia is an inguinal hernia containing the vermiform appendix.

The appendix may be completely normal, incarcerated, inflamed, gangrenous or perforated. The condition is most commonly right sided, although left sided cases occur with intestinal malrotation, situs abnormalities or a highly mobile caecum.

Management depends almost entirely on the condition of the appendix and degree of contamination, rather than on the label Amyand hernia itself.

Most cases resemble an ordinary inguinal hernia.

When appendicitis develops within the sac, the patient may have an acutely painful irreducible groin swelling with local erythema and tenderness.

Classical migratory appendicitis pain may be absent because the inflamed appendix is confined within the hernia.

Perforation can produce a groin abscess, scrotal infection, abdominal wall infection or generalised sepsis.

If the appendix is normal, reduce it into the abdomen and perform standard mesh inguinal hernia repair.

Routine removal of a normal appendix is usually unnecessary in adults because appendicectomy converts a clean operation into a potentially contaminated one and provides no clear benefit. Removal can be considered if the appendix is traumatised, densely adherent within the sac or anatomically abnormal.

If the appendix is acutely inflamed but not perforated, perform appendicectomy. The choice of hernia repair depends on contamination. Carefully selected clean contaminated cases may still undergo synthetic mesh repair, but the decision should account for local contamination, tissue quality and infection risk. Evidence remains limited because Amyand hernia data largely consist of small series and case reports.

If the appendix is gangrenous or perforated, perform appendicectomy and adequate source control. Avoid permanent synthetic mesh when there is frank pus, gross enteric contamination or established local infection.

When perforation produces diffuse peritonitis or the appendix cannot be safely managed through the groin incision, add laparoscopy or laparotomy as required.

For uncomplicated appendicitis within the sac:

Ceftriaxone 2 g IV plus metronidazole 500 mg IV before surgery provides appropriate enteric Gram negative and anaerobic coverage.

For perforation or established complicated intra abdominal infection:

Ceftriaxone 2 g IV every 24 hours plus metronidazole 500 mg IV every 12 hours.

Severe sepsis or extensive contamination may instead be treated with piperacillin tazobactam 4.5 g IV every 8 hours by extended infusion, adjusted for renal function.

Clinical toolsCalculators

BMI GCS EDD Parkland Formula

Corrected Sodium Corrected Calcium Anion Gap Creatinine Clearance Insulin Calculations qSOFA Wells PE Wells DVT CHA₂DS₂-VASc HAS-BLED CURB-65 Centor/McIsaac

Obturator Hernia

An obturator hernia is protrusion of intra abdominal contents through the obturator canal alongside the obturator neurovascular bundle.

It is rare but clinically important because diagnosis is often delayed until small bowel obstruction or strangulation develops.

The typical patient is an older, thin woman, particularly after multiple pregnancies or significant loss of preperitoneal fat.

The hernia neck is narrow and rigid, giving it a high risk of bowel compromise.

Most patients present with features of small bowel obstruction rather than an obvious groin mass.

There may be abdominal pain, vomiting, distension and constipation.

Howship Romberg sign: pain along the medial thigh caused by compression of the obturator nerve, often extending toward the knee and worsened by hip extension, abduction or internal rotation.

Hannington Kiff sign: absent thigh adductor reflex with a preserved patellar reflex.

Neither sign is sufficiently sensitive to exclude the diagnosis when absent.

A palpable groin mass is usually absent.

Obturator hernia requires operative repair.

Begin bowel obstruction resuscitation with fasting, IV crystalloid, electrolyte correction and nasogastric decompression when vomiting or significant distension is present.

If strangulation or bowel necrosis is suspected, give enteric Gram negative and anaerobic coverage, for example:

Ceftriaxone 2 g IV every 24 hours plus metronidazole 500 mg IV every 12 hours.

Proceed urgently to surgery.

Laparoscopic repair is appropriate in a haemodynamically stable patient when expertise is available because it permits evaluation of both obturator canals and direct assessment of bowel viability.

Laparotomy remains appropriate with major bowel distension, uncertain anatomy, peritonitis, haemodynamic instability or when bowel resection is anticipated.

After reduction, allow questionable bowel to reperfuse before deciding viability. Resect clearly necrotic bowel.

The obturator defect can be closed with sutures or mesh. Mesh provides a broad durable repair in a clean operative field. Published series show increasing use of laparoscopic mesh repair with low reported recurrence.

When bowel perforation or gross contamination is present, avoid placing permanent synthetic mesh directly into a heavily contaminated operative field and choose primary closure or delayed reconstruction according to defect size and tissue quality.

Amyand Hernia

Overview

Clinical Features

Diagnosis

Management

Overview

Clinical Features

Diagnosis

Management